<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./vue.2.5.1.js"></script>
</head>

<body>

    <div id="app">
        <div>
            <input type="text" v-model="foo">
            <span>{{foo}}</span>
            <button @click="foo='fuck'">数值冻结测试按钮</button>
        </div>
    </div>

    <script>
        var obj = {
            foo: 'bar'
        }

        Object.freeze(obj)

        new Vue({
            el: '#app',
            data: obj
        })
    </script>
</body>